7 month old price!

Sale 1:

Sold for 85 keys + Professional Australium Sniper Rifle* (~40) = 125 keys

http://www.tf2outpost.com/trade/27318898

http://backpack.tf/profiles/76561198087962998?time=1446969600 (November 8th)

http://backpack.tf/profiles/76561198087962998?time=1447056000 (November 9th)

http://backpack.tf/profiles/76561198087962998?time=1446969600&compare=1447056000

Sale 2:

Sold for 93 keys + 30 CS:GO keys* (~33) + FN Thunderbolt Sniper Rifle (>14) + Specialised Australium SMG (~8) + Sweets (1) = >149 keys

(B/O caps it at 140 keys)

http://www.tf2outpost.com/trade/27609764

http://backpack.tf/profiles/76561198031371895?time=1451376000 (December 29th)

http://backpack.tf/profiles/76561198031371895?time=1451556714 (December 31st)

http://backpack.tf/profiles/76561198031371895?time=1451555885&compare=1451376000

http://i.imgur.com/FJuxYPe.png

Sale 3:

Involved in a bulk deal

http://www.tf2outpost.com/trade/27458354

http://backpack.tf/profiles/76561198117497146?time=1447747200 (November 17th)

http://backpack.tf/profiles/76561198117497146?time=1448006400 (November 20th)

http://backpack.tf/profiles/76561198117497146?time=1448006400&compare=1447747200

Mini-suggestion for Professional Australium Sniper Rifle*:

http://backpack.tf/stats/Strange/Professional%20Killstreak%20Australium%20Sniper%20Rifle/Tradable/Craftable

Highest buyer at 39 keys and lowest seller at 40 keys; taking a value of 40 keys.

Mini-suggestion for CS:GO keys*:

Average rate seems to be approximately 10:11.

Mini-suggestion for FN Thunderbolt Sniper Rifle*:

http://steamcommunity.com/market/listings/440/Thunderbolt%20Sniper%20Rifle%20%28Factory%20New%29

Recent sales ranging from $35-42 USD; definitely above 14 keys.

Notes:

http://www.tf2outpost.com/trade/27318898 - B/O of 135 keys

No other sales within the past 2 months. None other on the market, not to mention new owner is more likely keeping it.

Conclusion:

Two valid sales at 125 and 140 keys. Taking a final range of 125-140 keys.

Feel free to support/counter my suggestion!